We've managed three trees after all. For the big one (which looks quite real, by the way, and your step-father would probably be pleasantly surprised), because it has to stand on the floor, we had to buy a whole new set of ornaments (cheap, plastic, but not bad looking) that the twins couldn't mangle. We didn't want to spend all of our time yelling "don't touch the tree," and we wanted the boys to be able to enjoy it, rather than making it a source of contention. So far, we've spent a lot of time replacing the ornaments they remove, but nothing has been broken. Another tree is on a counter where they can't reach it, and the white tree (with a lot of delicate things on it) is in my office, where there are baby gates on each of the doors. Too date, they've been happy just to look at it from afar. In fact, Jack gives a little gasp of delight whenever he sees it, as though he'd forgotten it was there.
As for my health, I've finally conquered the anemia! There was a time when I was on a new antidepressant that made me sleepy all the time, but we've changed that and I feel much better.
As a result, now that I've finished my Christmas shopping, I hope to get in several hours of writing a day, and leave everything else for the evening. We'll see how that works out ...